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Re: [RFC v3 23/23] RISC-V: Use 64-bit vdso syscalls


* Alistair Francis:

> Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
> ---
>  sysdeps/unix/sysv/linux/riscv/init-first.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/sysdeps/unix/sysv/linux/riscv/init-first.c b/sysdeps/unix/sysv/linux/riscv/init-first.c
> index 155a4a2c0c..fa9c690cdd 100644
> --- a/sysdeps/unix/sysv/linux/riscv/init-first.c
> +++ b/sysdeps/unix/sysv/linux/riscv/init-first.c
> @@ -43,11 +43,11 @@ _libc_vdso_platform_setup (void)
>    PTR_MANGLE (p);
>    VDSO_SYMBOL (gettimeofday) = p;
>  
> -  p = _dl_vdso_vsym ("__vdso_clock_gettime", &linux_version);
> +  p = _dl_vdso_vsym ("__vdso_clock_gettime64", &linux_version);
>    PTR_MANGLE (p);
>    VDSO_SYMBOL (clock_gettime) = p;
>  
> -  p = _dl_vdso_vsym ("__vdso_clock_getres", &linux_version);
> +  p = _dl_vdso_vsym ("__vdso_clock_getres_time64", &linux_version);
>    PTR_MANGLE (p);
>    VDSO_SYMBOL (clock_getres) = p;
>  }

I believe this will lose vDSO acceleration for RV64 on older kernels
which do not define __vdso_clock_getres_time64.

Thanks,
Florian


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